Remarkably Enhanced Negative Electrocaloric Effect in PbZrO3 Thin Film by Interface Engineering

Ming Wu, Dongsheng Song, Mengyao Guo, Jihong Bian, Junning Li, Yaodong Yang, Haitao Huang, Stephen J. Pennycook, Xiaojie Lou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

The electrocaloric effect in ferroelectric materials has drawn much attention due to its potential applications in integrated circuit cooling and novel cooling devices. In contrast to the widely researched positive electrocaloric effect, the negative electrocaloric effect has received much less attention due to the lack of any effective methods for significant enhancement. In this work, we fabricated PbZrO3 thin film on a Pt/Si substrate by the sol-gel method. By controlling the interface conditions between the thin film and substrate, we induced defects into the interface and stabilized a transient ferroelectric phase in the PbZrO3 thin film. The emergence of the transient ferroelectric phase postpones the antiferroelectric-ferroelectric phase transition. As a result, a negative electrocaloric effect up to -18.5 K is estimated near room temperature, the highest one ever reported in this temperature range. This result suggests a new strategy to enhance the negative electrocaloric effect and may benefit the application of PbZrO3 thin films in cooling devices.

Original languageEnglish
Pages (from-to)36863-36870
Number of pages8
JournalACS Applied Materials and Interfaces
Volume11
Issue number40
DOIs
Publication statusPublished - 9 Oct 2019

Keywords

  • antiferroelectric
  • interface engineering
  • negative electrocaloric effect
  • PbZrO
  • thin films

ASJC Scopus subject areas

  • Materials Science(all)

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